Mirror and aperture assembly. The mirror is concave and only one-sided. Dia=3.8cm. The aperture hole diameters=6, 10, 16mm.
The mirror mounting shaft presses into a hole at the base of the mount. The collar at the end retains a cork friction device.
The mirror and bullseye lens have the same diameter and can be interchanged. Dia=3.8cm
When mounted to the mirror frame, the bullseye lens can be inserted into a hole on the stage and used to illuminate the sample from above.